21095423 has 2 divisors, whose sum is σ = 21095424. Its totient is φ = 21095422.

The previous prime is 21095401. The next prime is 21095429. The reversal of 21095423 is 32459012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21095423 - 2⁸ = 21095167 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21095392 and 21095401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21095429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547711 + 10547712.

It is an arithmetic number, because the mean of its divisors is an integer number (10547712).

Almost surely, 2^21095423 is an apocalyptic number.

21095423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21095423 is an equidigital number, since it uses as much as digits as its factorization.

21095423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21095423 is about 4592.9753972779. The cubic root of 21095423 is about 276.3096669572.

The spelling of 21095423 in words is "twenty-one million, ninety-five thousand, four hundred twenty-three".